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Read the following description of a data set.$\newline$A food scientist wants to understand how much sugar children like in their desserts. He sets up a study where children taste cups of vanilla pudding with varying sweetness and rate each cup on a scale of $1$ to $10$, where $10$ is excellent.For each tasting, the food scientist writes down the grams of sugar in the pudding cup, $x$, as well as its rating, $y$.The least squares regression line of this data set is:$y = 0.216x - 4.085$$\newline$Complete the following sentence:$\newline$For each additional gram of sugar in a pudding cup, the least squares regression line predicts its rating will increase by ___.